1967 GMC G15/G1500 Van Engine: 3.8L L6; Universal; with Factory Installed A/C; Position: Rear;. 1967 GMC G15/G1500 Van Engine: 4.6L V8; Universal; with Factory Installed A/C; Position: Rear;. 1967 GMC G15/G1500 Van Engine: 5.4L V8; Universal; with Factory Installed A/C; Position: Rear;.